Malicious PDF — malware analysis report

Static analysis result for SHA-256 716fc21810b26a88…

MALICIOUS

PDF

70.4 KB Created: 2021-03-03 21:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e8cf0f3822db45e8b08d69e3f114abbf SHA-1: ca891595c4cde32c2c28f6d5874da2db978268b5 SHA-256: 716fc21810b26a88e42f21f3567fd1000f0f3ed33f1a3456157e28b57b286035
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it's a study guide, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/wix?keyword=ela+study+guide+for+8th+grade PDF link annotation
    • http://boguvijuximu.22web.org/what_is_the_best_exercise_for_elderly.pdfIn PDF document text
    • https://vusubidasezojix.weebly.com/uploads/1/3/5/3/135399418/tezonesasaf.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/6643120.pdfIn PDF document text
    • http://4338bacchus.com/dasizupenefekizinopzm8nd.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/sijotunekomuw.pdfIn PDF document text
    • http://maykistore.ru/pamumalikalimozigasatej8h0ak.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/lutufakiron.pdfIn PDF document text
    • http://triple-doska4.club/examples_of_dok_level_3_math_questionse1hok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webidiwotew.epizy.com/runuviler.pdfIn PDF document text
    • http://napezidemilolez.epizy.com/90460385466.pdfIn PDF document text
    • http://japorivexasore.epizy.com/notigifagufomowofopu.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/begujikexeza.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 5424 bytes
SHA-256: 4993494868477530d7fa6c0344d5bba763a873f25f53217efdbdbc08ead4a519
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 9820 bytes
SHA-256: 2ec02a2f8eb9f2c71d5614b006b0795c1f3d252194d7e4999fd17e2389683e30

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